US PATENT SUBCLASS 968 / 470
.~.~ Using electromagnetic coupling between electric power source and balance [G04C 3/06]


Current as of: June, 1999
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968 /   HD   HOROLOGY

446  DD  ELECTROMECHANICAL CLOCKS OR WATCHES INDEPENDENT OF OTHER TIMEPIECES AND IN WHICH THE MOVEMENT IS MAINTAINED BY ELECTRIC MEANS (synchronization subclass 506) [G04C 3/00] {8}
466  DD  .~ Wherein movement is regulated by a balance (construction thereof subclass 110) [G04C 3/04] {2}
470.~.~ Using electromagnetic coupling between electric power source and balance [G04C 3/06] {5}
471  DD  .~.~.~> The balance controlling contacts and mechanically driving the gear-train [G04C 3/06B]
472  DD  .~.~.~> The balance controlling contacts, the gear-train or several gear-trains being driven electromagnetically thereby [G04C 3/06C]
473  DD  .~.~.~> The balance controlling contacts, the balance driving electromagnet simultaneously driving the gear-train [G04C 3/06D]
474  DD  .~.~.~> The balance controlling indirectly, i.e., without mechanical connection, contacts, e.g., by magnetic or optic means, etc. [G04C 3/06E]
475  DD  .~.~.~> The balance controlling gear-train by means of static switches, e.g., transistor circuits, etc. (synchronization of balance subclass 520) [G04C 3/06F] {3}